Fluid–Structure Interaction

The effect of solid motion on fluid flow can be modeled by coupling ANSYS Fluent software with ANSYS structural mechanics solutions. Using the unified user environment (ANSYS Workbench) fluid–-structure interaction (FSI) simulations can be easily set up. ANSYS Fluent FSI solutions are an Industry leader in robustness, applicability and accuracy for two-way FSI. There is no need to purchase, administer or configure third-party coupling and pre- and post-processing software.

The robust and flexible algorithm to deform a given fluid volume mesh in ANSYS Fluent tolerates even very large boundary displacements. These displacements may be defined explicitly by the user or be the implicit result of an FSI simulation with ANSYS structural mechanics software or from the rigid body solver within ANSYS Fluent. In all cases, boundary displacements are diffused into the interior volume mesh while ensuring that small or near-wall elements are deformed less. This maintains good boundary layer resolution and allows for larger mesh deformations with a single mesh topology.

Two-way transient analysis of blood flow through a three leaf mitral valve. The fluid is non-Newtonian and the material is an anisotropic hyperelastic tissue.


In situations in which the boundary motion is more extreme and a single-mesh topology is simply insufficient to model the entire displacement, ANSYS Fluent provides options for automatic remeshing when required during a simulations